content: /*
   * Copyright (C) 2015 Square, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package hu.akarnokd.rxjava3.retrofit;
  
  import java.io.IOException;
  
  import io.reactivex.rxjava3.annotations.Nullable;
  import retrofit2.Response;
  
  /** 
   * The result of executing an HTTP request.
   * @param <T> the value type of the result 
   */
  public final class Result<T> {
    public static <T> Result<T> error(Throwable error) {
      if (error == null) throw new NullPointerException("error == null");
      return new Result<>(null, error);
    }
  
    public static <T> Result<T> response(Response<T> response) {
      if (response == null) throw new NullPointerException("response == null");
      return new Result<>(response, null);
    }
  
    private final @Nullable Response<T> response;
    private final @Nullable Throwable error;
  
    private Result(@Nullable Response<T> response, @Nullable Throwable error) {
      this.response = response;
      this.error = error;
    }
  
    /**
     * The response received from executing an HTTP request. Only present when {@link #isError()} is
     * false, null otherwise.
     * @return the response object
     */
    public @Nullable Response<T> response() {
      return response;
    }
  
    /**
     * The error experienced while attempting to execute an HTTP request. Only present when {@link
     * #isError()} is true, null otherwise.
     * <p>
     * If the error is an {@link IOException} then there was a problem with the transport to the
     * remote server. Any other exception type indicates an unexpected failure and should be
     * considered fatal (configuration error, programming error, etc.).
     * 
     * @return the Throwable error
     */
    public @Nullable Throwable error() {
      return error;
    }
  
    /** 
     * {@code true} if the request resulted in an error. See {@link #error()} for the cause.
     * @return {@code true} if the request resulted in an error
     */
    public boolean isError() {
      return error != null;
    }
  }
  